1 /* sig.h -- header file for signal handler definitions. */
3 /* Copyright (C) 1994-2006 Free Software Foundation, Inc.
5 This file is part of GNU Bash, the Bourne Again SHell.
7 Bash is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License along
18 with Bash; see the file COPYING. If not, write to the Free Software
19 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
21 /* Make sure that this is included *after* config.h! */
23 #if !defined (_SIG_H_)
28 #if !defined (SIGABRT) && defined (SIGIOT)
29 # define SIGABRT SIGIOT
32 #define sighandler RETSIGTYPE
33 typedef RETSIGTYPE SigHandler __P((int));
35 #if defined (VOID_SIGHANDLER)
36 # define SIGRETURN(n) return
38 # define SIGRETURN(n) return(n)
39 #endif /* !VOID_SIGHANDLER */
41 /* Here is a definition for set_signal_handler () which simply expands to
42 a call to signal () for non-Posix systems. The code for set_signal_handler
43 in the Posix case resides in general.c. */
44 #if !defined (HAVE_POSIX_SIGNALS)
45 # define set_signal_handler(sig, handler) (SigHandler *)signal (sig, handler)
47 extern SigHandler *set_signal_handler __P((int, SigHandler *)); /* in sig.c */
48 #endif /* _POSIX_VERSION */
50 /* Definitions used by the job control code. */
51 #if defined (JOB_CONTROL)
53 #if !defined (SIGCHLD) && defined (SIGCLD)
54 # define SIGCHLD SIGCLD
57 #if !defined (HAVE_POSIX_SIGNALS) && !defined (sigmask)
58 # define sigmask(x) (1 << ((x)-1))
59 #endif /* !HAVE_POSIX_SIGNALS && !sigmask */
61 #if !defined (HAVE_POSIX_SIGNALS)
62 # if !defined (SIG_BLOCK)
64 # define SIG_SETMASK 3
65 # endif /* SIG_BLOCK */
67 /* sigset_t defined in config.h */
69 /* Make sure there is nothing inside the signal set. */
70 # define sigemptyset(set) (*(set) = 0)
72 /* Initialize the signal set to hold all signals. */
73 # define sigfillset(set) (*set) = sigmask (NSIG) - 1
75 /* Add SIG to the contents of SET. */
76 # define sigaddset(set, sig) *(set) |= sigmask (sig)
78 /* Delete SIG from signal set SET. */
79 # define sigdelset(set, sig) *(set) &= ~sigmask (sig)
81 /* Is SIG a member of the signal set SET? */
82 # define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0)
84 /* Suspend the process until the reception of one of the signals
85 not present in SET. */
86 # define sigsuspend(set) sigpause (*(set))
87 #endif /* !HAVE_POSIX_SIGNALS */
89 /* These definitions are used both in POSIX and non-POSIX implementations. */
91 #define BLOCK_SIGNAL(sig, nvar, ovar) \
93 sigemptyset (&nvar); \
94 sigaddset (&nvar, sig); \
95 sigemptyset (&ovar); \
96 sigprocmask (SIG_BLOCK, &nvar, &ovar); \
99 #if defined (HAVE_POSIX_SIGNALS)
100 # define BLOCK_CHILD(nvar, ovar) \
101 BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
102 # define UNBLOCK_CHILD(ovar) \
103 sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
104 #else /* !HAVE_POSIX_SIGNALS */
105 # define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
106 # define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
107 #endif /* !HAVE_POSIX_SIGNALS */
109 #endif /* JOB_CONTROL */
111 /* Extern variables */
112 extern volatile int sigwinch_received;
114 extern int interrupt_immediately;
115 extern int terminate_immediately;
117 /* Functions from sig.c. */
118 extern sighandler termsig_sighandler __P((int));
119 extern void termsig_handler __P((int));
120 extern sighandler sigint_sighandler __P((int));
121 extern void initialize_signals __P((int));
122 extern void initialize_terminating_signals __P((void));
123 extern void reset_terminating_signals __P((void));
124 extern void top_level_cleanup __P((void));
125 extern void throw_to_top_level __P((void));
126 extern void jump_to_top_level __P((int)) __attribute__((__noreturn__));
128 extern sighandler sigwinch_sighandler __P((int));
129 extern void set_sigwinch_handler __P((void));
130 extern void unset_sigwinch_handler __P((void));
132 /* Functions defined in trap.c. */
133 extern SigHandler *set_sigint_handler __P((void));
134 extern SigHandler *trap_to_sighandler __P((int));
135 extern sighandler trap_handler __P((int));